A switching power supply
A switching power supply and resistor technology, applied in the field of electronic information, can solve problems affecting system efficiency, large voltage difference, etc., and achieve the effect of reducing power consumption and reducing voltage difference
Active Publication Date: 2016-03-16
KONKA GROUP
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Problems solved by technology
[0009] The invention provides a switching power supply circuit, which is used to solve the problem in the prior art that the output voltage of the switching power supply and the voltage required for standby are large, thereby affecting the system efficiency.
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[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0032] In order to solve the problems in the prior art, the present invention provides a switching power supply, such as figure 2 As shown, it includes: a feedback loop, the feedback loop includes: feedback resistors R1, R2, a reference voltage regulator N2, an optocoupler N1 and a compensation circuit, and further, the switching power supply also includes the feedback resistor R1 A voltage modulation circuit connected in parallel, the voltage modulation circ...
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The invention discloses a switch power supply which comprises a feedback loop; and the feedback loop comprises feedback resistors R1 and R2, a reference voltage stabilization source, an optocoupler and a compensation circuit, and the switch power supply is characterized by further comprising a voltage modulating circuit connected in parallel with the feedback resistor R1, and the voltage modulating circuit comprises a voltage modulating resistor R7 and a status modulating part; when the voltage modulating circuit is set to be in a normal working status at a device where the switch power supply is positioned, the parallel connection between the voltage modulating circuit and the feedback resistor R1 is disconnected through the status modulating part; and when the device where the switch power supply is positioned is in a standby status, the parallel connection between the voltage modulating circuit and the feedback resistor R1 is connected through the status modulating part. In the switch power supply, by freely adjusting the feedback resistors, the problem that the system efficiency is influenced as the standby voltage output by the switch power supply and the voltage required by standby has large difference can be solved.
Description
technical field [0001] The invention relates to the technical field of electronic information, in particular to a switching power supply. Background technique [0002] In the current LED TV system, two parts must be included: switching power supply and signal processing board. In general design, the TV is required to have a standby state, and it can be started normally by remote control or other control in the standby state. This requires the switching power supply to have a constant DC output when the AC input is normal, which is recorded as Vo1. Vo1 is required to be in the TV standby state. In this state, the power supply can be continuously supplied to keep the control part (CPU) of the signal processing board working normally. [0003] In some systems, Vo1 is not only used as a standby power supply, but also used for other purposes, such as power amplifiers, etc., so Vo1 is defined as 12V, and Vo1 is converted into a lower voltage required for standby through the power...
Claims
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IPC IPC(8): H02M3/156H02M3/158
CPCY02B70/10
Inventor 杞耀军陈立春
Owner KONKA GROUP